"Coprinus atramentarius, Inky Cap
Good but tricky edibles; containing antabuse, if taken with alcohol (or even coffee) they will leave one tingly, flushed, headackey, nauseous; since at maturity they will dissolve themselves into an inedible ink, they must be cooked young."
In publication, Page 38: "Reflections on the Fungaloids" by B.L. Williamson, Ottawa, 1992. ISBN 1-894572-65-3